WO2007114360A1 - 食い込み式管接続構造、食い込み式管接続方法、及び現地配管接続方法 - Google Patents
食い込み式管接続構造、食い込み式管接続方法、及び現地配管接続方法 Download PDFInfo
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- WO2007114360A1 WO2007114360A1 PCT/JP2007/057178 JP2007057178W WO2007114360A1 WO 2007114360 A1 WO2007114360 A1 WO 2007114360A1 JP 2007057178 W JP2007057178 W JP 2007057178W WO 2007114360 A1 WO2007114360 A1 WO 2007114360A1
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- Prior art keywords
- pipe
- bite
- sleeve
- pipe connection
- joint body
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L19/00—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts
- F16L19/08—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts with metal rings which bite into the wall of the pipe
- F16L19/10—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts with metal rings which bite into the wall of the pipe the profile of the ring being altered
- F16L19/14—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts with metal rings which bite into the wall of the pipe the profile of the ring being altered the rings being integral with one of the connecting parts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L47/00—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics
- F16L47/14—Flanged joints
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L19/00—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts
- F16L19/08—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts with metal rings which bite into the wall of the pipe
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L19/00—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts
- F16L19/08—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts with metal rings which bite into the wall of the pipe
- F16L19/10—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts with metal rings which bite into the wall of the pipe the profile of the ring being altered
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L19/00—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts
- F16L19/08—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts with metal rings which bite into the wall of the pipe
- F16L19/10—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts with metal rings which bite into the wall of the pipe the profile of the ring being altered
- F16L19/103—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts with metal rings which bite into the wall of the pipe the profile of the ring being altered with more than one ring per pipe end being used
Definitions
- Bite-type pipe connection structure Bite-type pipe connection method, bite-type pipe connection method, and local pipe connection method
- the present invention relates to a bite type pipe connection structure, and a pipe joint, valve, closing valve, refrigeration cycle apparatus and hot water supply apparatus using the same.
- the present invention also relates to a bite type pipe connection method and a local pipe connection method.
- the pipe joint is removable from the fluid pipe so that the fluid pipe can be easily replaced and repaired.
- a refrigeration cycle apparatus such as an air conditioner in which a refrigerant flows through a fluid pipe
- a flare type pipe joint has been used.
- the refrigerant in the refrigeration cycle system has been changed from conventional chlorofluorocarbon refrigerants to high-pressure carbon (HC) refrigerants such as flammable propane, ethane, ethylene, npentane, nbutane, and isobutane.
- HC high-pressure carbon
- the refrigeration cycle device here refers to all devices operated in the refrigeration cycle, such as air conditioners, dehumidifiers, heat pump hot water supply devices, refrigerators, refrigeration devices, and cooling devices for manufacturing processes. Is included.
- FIG. 26 and FIG. 27 show a bite type pipe joint described in Patent Document 1.
- the bite type pipe joint includes a joint body 201, a fastening nut 202 as a fastening member, and a cylindrical bite type sleeve 203.
- the joint body 201 has a pipe connection port 211 into which the tip of the connection pipe 204 is inserted.
- a male screw 212 is formed on the outer peripheral surface of the joint body 201.
- a guide taper surface 213 is formed at the opening end of the pipe connection port 211.
- the bite type sleeve 203 is connected to the pipe. When pressed toward the connecting port 211, the end portion (ie, the front end portion 203 a) near the joint body 201 of the edging and the embedded sleeve 203 is directed toward the central axis of the connecting pipe 204 by the guide taper surface 213. Guided.
- the fastening nut 202 has a through hole 222 into which the connecting pipe 204 is inserted.
- a pressing taper surface 223 for pressing the end portion (that is, the rear end portion) of the bite type sleeve 203 near the fastening nut 202 is provided around the through hole 222.
- a female screw 225 that is screwed with the male screw 212 of the joint body 201 is provided.
- the bite type sleeve 203 is arranged between the joint body 201 and the fastening nut 202.
- the bite type sleeve 203 has a through hole 231 into which the connecting pipe 204 is fitted.
- the cross-sectional shape of the bite type sleeve 203 in the axial direction is a substantially rectangular shape that is long in the axial direction.
- a pressure receiving tapered surface 232 that abuts against the pressing taper surface 223 is formed at the rear end of the bite type sleeve 203.
- An axial pressing force is applied to the pressure receiving tapered surface 232 from the fastening nut 202.
- the front end portion 203 a of the bite type sleeve 203 can abut on the guide taper surface 213.
- the assembly of the bite type pipe joint configured as described above is performed as follows. That is, first, the tip end of the connection pipe 204 is inserted into the through hole 222 of the fastening nut 202 and the through hole 231 of the bite type sleeve 203, and the fastening nut 202 and the bite type sleeve 203 are assembled to the connection pipe 204. . Next, the tip of the connection pipe 204 is inserted into the pipe connection port 211. At this time, the front end portion 203 a of the bite-in sleeve 203 is disposed to face the guide taper surface 213 of the joint body 201.
- the female screw 225 of the fastening nut 202 is screwed into the male screw 212 of the joint body 201, and the fastening nut 202 is fastened to the joint body 201 with a predetermined torque using a fastening tool.
- the front end portion 203a of the bite-in sleeve 203 is pressed against the guide taper surface 213 by the fastening nut 202.
- the front end portion 203a of the bite-in sleeve 203 is pushed and bent toward the central axis of the connection pipe 204 by the guide taper surface 213.
- FIG. 27 shows a state in which the fastening nut 202 is fastened to the joint body 201.
- connection pipe 204 In the conventional bite type pipe joint, the distal end portion of the connection pipe 204 is not inserted into the pipe connection port 211 to the innermost position, that is, the front end surface of the connection pipe 204 and the innermost portion of the pipe connection port 211 are not inserted.
- fastening nut 202 is fastened to the joint body 201 with the gap L between them.
- the front end portion 203a of the bite-in sleeve 203 is pushed and bent toward the central axis of the connection pipe 204 and bites into the connection pipe 204. Move in the direction indicated by the white arrow A in Fig. 26.
- the front end portion 203a of the bite-in type sleeve 203 cannot sufficiently bite into the connection pipe 204, and there is a possibility that the sealing performance will be insufficient due to cracks in the connection portion with the connection pipe 204. .
- This problem also occurs in pipe joints used in other than refrigeration cycle devices such as air conditioners.
- Patent Document 1 Japanese Unexamined Patent Publication No. 2003-74768
- Patent Document 2 JP 2005-36947 A
- An object of the present invention is a bite type in which good sealing performance can be obtained at a connection portion with a connection pipe even when the distal end portion of the connection pipe to be connected is not inserted to the innermost end of the pipe connection port. It is to provide a pipe connection structure. Another object of the present invention is to provide a pipe joint, a valve, a shut-off valve, a refrigeration cycle apparatus, a bite type pipe connection method and a local pipe connection method using such a bite type pipe connection structure.
- a joint body having a pipe connection port into which a connection pipe is inserted, and a cylindrical shape fitted to the outer periphery of the connection pipe
- a bite type and pipe type pipe connection structure comprising a bite type sleeve and a fastening member fastened to the joint body so as to press the bite type sleeve toward the inside of the joint body.
- the outer peripheral surface of the erosion sleeve and the embedded sleeve is a tapered outer peripheral surface that decreases in diameter as it approaches the inside of the joint body.
- a guide taper surface that increases in diameter as it approaches the fastening member is provided at a portion of the pipe connection port closer to the fastening member.
- a biting sleeve abuts against the guide taper surface.
- the guide taper surface has a small-diameter portion that guides the tip of the bite-type sleeve so as to bite into the connecting pipe, and a large-diameter portion that seals closely with the taper outer peripheral surface of the bite-type sleeve.
- the inclination angle of the small diameter portion with respect to the central axis of the guide taper surface is larger than the inclination angle of the large diameter portion with respect to the central axis.
- the taper outer surface of the bite-type sleeve comes into close contact with the large-diameter part of the guide taper surface. It is possible to make close contact S. Furthermore, the large diameter portion where the tapered outer peripheral surface of the bite-in sleeve is in close contact is the portion of the guide taper surface where the inclination angle with respect to the central axis is relatively small, so that the tapered outer peripheral surface and the large diameter portion are in close contact with each other. A large pressing force is not required, and the contact area between the tapered outer peripheral surface and the large diameter portion can be increased.
- the taper outer peripheral surface of the bite type sleeve and the guide taper surface of the joint body are securely sealed while ensuring a sufficient bite amount at the tip of the bite type sleeve, and the seal at the connection part with the connecting pipe is ensured. Performance is improved.
- the guide taper surface has an intermediate portion between the small diameter portion and the large diameter portion, and the inclination angle of the intermediate portion with respect to the central axis of the guide taper surface is small and large. It is preferably smaller than the inclination angle of the diameter portion.
- the intermediate part can be used as one of the means for adjusting the amount of biting of the biting sleeve S.
- a joint book having a pipe connection port into which a connection pipe is inserted.
- a bite type pipe having a body, a cylindrical bite type sleeve fitted to the outer periphery of the connection pipe, and a fastening member fastened to the joint body so as to press the bite type sleeve toward the inside of the joint body
- a connection structure is provided.
- the outer peripheral surface of the bite-in sleeve is a tapered outer peripheral surface that decreases in diameter as it approaches the inside of the joint body.
- a guide taper surface that increases in diameter as it approaches the fastening member is provided at a portion of the pipe connection port closer to the fastening member.
- a biting sleeve can be brought into contact with the guide taper surface.
- the bite type sleeve has a front end portion closer to the inner side of the joint body and a rear side portion farther from the inner side of the joint body.
- the inclination angle of the tapered outer peripheral surface at the tip of the bite type sleeve with respect to the central axis is smaller than the inclination angle of the guide tapered surface with respect to the central axis of the guide taper surface.
- the inclination angle of the taper outer peripheral surface at the rear side with respect to the central axis of the bite type sleeve is larger than the inclination angle of the taper outer peripheral surface at the tip part with respect to the central axis of the bite type sleeve, and the central axis of the guide taper surface Is smaller than the inclination angle of the guide taper surface.
- the outer diameter of the rear side is larger than the outer dimension of the tip, and there is a step between the tip and the rear.
- the distal end portion of the bite type sleeve has a relatively large bite angle. Bite into. For this reason, the force of pushing the connecting pipe toward the innermost part of the pipe connection port decreases. As a result, even when the tip of the connection pipe is not inserted to the end of the pipe connection port, it is possible to prevent the connection pipe from moving toward the back of the pipe connection port as the fastening member is fastened. Good sealing performance can be obtained at the connecting part.
- the taper outer surface of the biting sleeve is in close contact with the guide taper surface, so that the taper outer surface and the guide taper surface are in close contact with each other without any hindrance. be able to. Therefore, the taper outer surface of the bite type sleeve and the guide taper surface of the fitting body are in close contact with each other while ensuring a sufficient bite amount at the tip of the bite type sleeve, and a seal at the connection part with the connecting pipe. Performance is improved.
- the tip of the bite type sleeve is connected to the connecting pipe until the taper outer peripheral surface and the guide taper surface come into close contact with each other. Amount of bite Can change the power S.
- the erosion and the retractable pipe connecting structure are integrated with the fastening member, and before the bite into the connecting pipe, the axial push from the fastening member is carried out. It is preferably separated from the fastening member by pressure.
- the bite type sleeve is integrated with the fastening nut, the number of parts can be reduced and the cost for parts management can be reduced.
- workability is further improved.
- the fastening member is a fastening nut that is screwed into the joint body, and the biting sleeve is attached to the inner wall of the fastening nut via the thin-walled connecting portion. It is preferable to be integrated with the fastening nut by being connected. In this case, the bite type sleeve can be separated from the fastening nut by fastening the fastening nut. Further, in this case, the force S that allows the fastening nut to bite into the connecting pipe without rotating the biting sleeve can be achieved. Therefore, the sealing performance at the connecting portion with the connecting pipe is improved.
- the erosion and retractable sleeve are integrated with the joint body and separated from the joint body by the axial pressing force from the fastening member. It ’s preferable.
- the bite type sleeve is integrated with the joint body, the number of parts can be reduced, and the cost for parts management can be reduced.
- the fastening member is a fastening nut screwed into the joint body, and the digging sleeve is joined substantially parallel to the central axis of the erosion sleeve. It is preferable to be integrated with the joint body by joining the pipe connection port of the joint body on the surface. Specific examples of the method of joining the bite type sleeve to the pipe connection port include adhesion and engagement. The bite type sleeve is integrated with the joint body in a state where it is exposed from the joint body.
- a pipe joint including at least two pipe connecting portions extending in different directions.
- the bite type pipe connection structure described above is used for at least one of these pipe connections. In this case, fluid leaks from the pipe connection. It can be suppressed and workability when connecting pipes is improved.
- a pipe joint including two pipe connections extending in different directions.
- the bite type pipe connection structure is used for one of the two pipe connection portions, and the pipe is connected to the other of the two pipe connection portions by brazing. In this case, it is suitable when the pipe is detachably connected to one of the pipe connection portions.
- a pipe joint including two pipe connections extending in different directions.
- the above bite type pipe connection structure is used for both pipe connection parts. In this case, it is suitable when connecting piping to both pipe connection parts so that removal is possible.
- connecting pipes having different diameters are connected to pipe connecting portions extending in different directions. This case is suitable when connecting pipes having different diameters.
- a valve comprising at least one pipe connection.
- the bite type pipe connection structure is used for the pipe connection portion. In this case, leakage from the pipe connection part can be suppressed, and workability when connecting pipes is improved.
- a shut-off valve comprising at least one pipe connecting portion.
- the bite type pipe connection structure is used for the pipe connection portion. In this case, leakage from the pipe connection portion can be suppressed, and workability when connecting the pipes is improved.
- a refrigeration cycle apparatus including a refrigerant circuit.
- the refrigerant circuit is provided with at least one pipe connection part to which the refrigerant pipe is detachably connected.
- the bite type pipe connection structure is used for the pipe connection portion.
- the refrigerant can be prevented from leaking from the connection portion with the refrigerant pipe, and workability when connecting the pipe is improved.
- the refrigerant circulating in the refrigerant circuit is preferably a high-pressure gas refrigerant.
- a high-pressure gas refrigerant For example, when carbon dioxide or the like is used as a refrigerant, the gas pressure in the refrigerant pipe becomes high, so that a pipe connection structure with less refrigerant leakage is required. According to the present invention, the reliability of the apparatus can be improved even in such a case.
- the refrigerant circulating in the refrigerant circuit is preferably a hydride carbon refrigerant.
- a hydride carbon refrigerant such as propane
- propane When a refrigeration refrigerant is used, a pipe connection structure with less refrigerant leakage is required. According to the present invention, the reliability of the apparatus can be improved even in such a case.
- the refrigeration cycle apparatus is preferably operated in a supercritical refrigeration cycle.
- the refrigerant gas pressure in the refrigerant pipe becomes high, so a pipe connection structure with less refrigerant leakage is required. According to the present invention, even in such a case, the reliability of the apparatus can be improved.
- the refrigeration cycle apparatus is preferably a heat pump hot water supply apparatus.
- the heat pump type hot water supply apparatus since the refrigerant gas pressure in the refrigerant pipe is increased in order to supply high-temperature hot water supply water, a pipe connection structure with less refrigerant leakage is required. According to the present invention, the reliability of the apparatus can be improved even in such a case.
- a hot water supply apparatus including a circuit through which hot water supply water circulates is provided.
- the circuit is provided with a pipe connection portion using the above-described bite type pipe connection structure.
- Hot water supply pipes are often constructed locally. In that respect, by using the above bite type pipe connection structure, leakage from the pipe connection part can be suppressed and workability can be improved.
- a bite type pipe connection method in a pipe joint having a pipe connection part using the bite type pipe connection structure consists of assembling a fastening member, a cleaver, and a retractable sleeve into the connection pipe, and then inserting the end of the connection pipe into the pipe connection port of the joint body, and a bite type into the guide taper surface of the joint body.
- the taper outer peripheral surface of the bite-in sleeve is pressed and brought into close contact with the guide taper surface. Therefore, even when the tip of the connection pipe is not inserted all the way into the pipe connection port, good sealing performance can be obtained at the connection with the connection pipe. Also, the bite type sleeve bite The taper outer peripheral surface and the guide taper surface are in close contact with each other while ensuring a sufficient amount of clearance.
- an on-site piping connection method for performing piping work on-site by applying the above-described bite type pipe connecting method.
- leakage from the pipe connection can be suppressed and workability is improved.
- FIG. 1 is a partial sectional view showing a connection state of a bite type pipe joint according to a first embodiment of the present invention.
- FIG. 2 is a partial cross-sectional view of a joint body in the pipe joint of FIG.
- FIG. 3 is a partial cross-sectional view of a fastening nut in the pipe joint of FIG.
- FIG. 4 is an enlarged view of the vicinity of the guide taper surface in FIG.
- FIG. 5 is an enlarged view of the vicinity of the bite type sleeve in FIG. 3.
- FIG. 6 is a partial cross-sectional view showing the state of the pipe joint of Fig. 1 when the connecting pipe is inserted into the pipe connection port and tightening of the fastening nut is started, and Fig. 6 (b) is a bite.
- FIG. 6 (c) is a partial cross-sectional view showing the state of the pipe joint of FIG. 1 when the fastening nut is tightened until the tip of the sleeve is in contact with the guide taper surface, and FIG. It is a fragmentary sectional view showing the state of the pipe joint.
- FIG. 7 is a partial cross-sectional view showing the state of the pipe joint of Fig. 1 when the tip of the bite type sleeve has bited in a predetermined amount
- Fig. 7 (b) is the tip of the bite type sleeve.
- FIG. 2 is a partial cross-sectional view showing a state of the pipe joint of FIG. 1 when the biting of the part is completed.
- FIG. 8 is a partial cross-sectional view showing a state in which a rivet, a leverage, a crevice at the tip of a retractable sleeve, and a state where the penetration is completed in the modified example of the pipe joint of FIG.
- FIG. 9 (a) and FIG. 9 (b) are partial cross-sectional views of a modification of the pipe joint of FIG. 1 in which the taper length of the small diameter portion is changed.
- Fig. 10 are partial cross-sectional views of modifications of the pipe joint of Fig. 1 in which the inclination angle of the small diameter portion is changed.
- FIG. 11 is a cross-sectional view of the guide taper surface of the joint body of the bite type pipe joint according to the second embodiment of the present invention.
- FIG. 12 shows the second condition when the connecting pipe is inserted into the pipe connection port and the fastening nut is started to be tightened.
- FIG. 12B is a partial cross-sectional view showing the state of the pipe joint of the embodiment, and
- FIG. 12B is a partial cross-sectional view showing the state of the pipe joint of the second embodiment when fastening of the fastening nut is completed.
- FIG. 13 (a) and FIG. 13 (b) are partial cross-sectional views of modifications of the pipe joint of the second embodiment in which the length of the intermediate portion of the guide taper surface is changed.
- FIG. 14 is a cross-sectional view of a guide taper surface provided in a joint body of a bite type pipe joint according to a third embodiment of the present invention.
- FIG. 15 is a sectional view of the vicinity of the bite-type sleeve of the pipe joint of the third embodiment.
- FIG. 16 (a) is a partial sectional view showing the state of the pipe joint of the third embodiment when the connecting pipe is inserted into the pipe connection port and tightening of the fastening nut is started. ) Is a partial cross-sectional view showing a state of the pipe joint of the third embodiment when fastening of the fastening nut is completed.
- FIG. 17 (a) and FIG. 17 (b) are partial cross-sectional views of a modification of the pipe joint of the third embodiment in which the length of the intermediate portion of the eclipse and the retractable sleeve is changed.
- FIG. 18 (a) is a partial cross-sectional view showing the state of the bite type pipe joint according to the fourth embodiment when the connection pipe is inserted into the pipe connection port and the fastening nut is started to be tightened. (b) is a partial cross-sectional view showing the state of the pipe joint of the fourth embodiment when the fastening nut is tightened until the tip of the bite-type sleeve comes into contact with the guide taper surface, and FIG. FIG. 10 is a partial cross-sectional view showing a state of the pipe joint of the fourth embodiment when fastening of the fastening nut is completed.
- FIG. 19 (a) is a partial sectional view showing a state of the bite type pipe joint according to the fifth embodiment when the connection pipe is inserted into the pipe connection port and the bite type sleeve is not pressed by the fastening nut.
- FIG. 19 (b) is a partial cross-sectional view showing the state of the pipe joint of the fifth embodiment when the fastening nut is tightened until the tip of the bite type sleeve comes into contact with the guide taper surface.
- c) is a partial cross-sectional view showing a state of the pipe joint of the fifth embodiment when the fastening nut is completely fastened.
- FIG. 20 is a cross-sectional view showing a connection state of the shut-off valve according to the sixth embodiment of the present invention.
- FIG. 21 is a partial cross-sectional view showing a connection state of a bite type different diameter pipe joint according to a seventh embodiment of the present invention.
- FIG. 22 is a schematic view of a refrigeration cycle apparatus according to an eighth embodiment of the present invention.
- FIG. 23 is a schematic view of a refrigeration cycle apparatus according to a ninth embodiment of the present invention.
- FIG. 24 is a schematic view of a refrigeration cycle apparatus according to a tenth embodiment of the present invention.
- FIG. 25 is a schematic view of a refrigeration cycle apparatus according to an eleventh embodiment of the present invention.
- FIG. 26 is a partial cross-sectional view of a conventional eclipse and built-in pipe joint showing a state before the fastening of the fastening nut to the joint body is completed.
- FIG. 27 is a partial cross-sectional view of the pipe joint of FIG. 26 showing a state after the fastening of the fastening nut to the joint body is completed.
- the bite type pipe joint according to the present embodiment is used for connecting a copper refrigerant pipe for a refrigeration cycle apparatus.
- the bite type pipe joint has a pipe connection part to which the pipe is detachably connected, and the bite type pipe connection structure is used for this pipe connection part.
- the bite type pipe joint is made of a copper alloy having a hardness higher than that of the copper pipe.
- the bite type pipe joint includes a joint body 1, a fastening nut 2 as a fastening member, and a cylindrical bite type sleeve 3.
- a fixed copper pipe 4 is connected to the base end of the joint body 1, that is, the end opposite to the fastening nut 2, and the joint end of the joint body 1, that is, the side close to the fastening nut
- a copper connecting pipe 5 is detachably connected to the end of the cable. Fixed piping 4 is not normally scheduled for removal from fitting body 1.
- the joint body 1 is composed of a socket part 11, a nut part 12, and a pipe connection part 13.
- the socket part 11 is brazed with the fixed pipe 4 inserted.
- the nut portion 12 has an outer shape that can easily hold the joint body 1 when the fastening nut 2 is fastened.
- a connecting pipe 5 is detachably connected to the pipe connecting portion 13 via a fastening nut 2.
- the socket part 11 and the nut part 12 are formed with a pipe connection port 14 into which an end of the fixed pipe 4 is inserted.
- the tip of the fixed pipe 4 is arranged and connected.
- the fixed pipe 4 is brazed while being in contact with the innermost part of the pipe connection port 14.
- a male screw 15 for screwing the fastening nut 2 is formed on the outer peripheral surface of the pipe connecting portion 13.
- a pipe connection port 16 for inserting the tip of the connection pipe 5 is formed in the pipe connection part 13.
- the tip of the connection pipe 5 is disposed and detachably connected.
- a guide taper surface 17 is formed at the end of the pipe connection port 16 near the fastening nut 2 (see FIG. 4).
- the guide taper surface 17 increases in diameter as it approaches the fastening nut 2.
- the leading end 3a of the biting sleeve 3 is guided by the guide taper surface 17 so as to bite into the connecting pipe 5, so that the connecting pipe 5 is fixed and the gap between the biting sleeve 3 and the connecting pipe 5 is sealed. Is done. Further, when the tapered outer peripheral surface 33 of the bite-in sleeve 3 is in close contact with the guide taper surface 17, the gap between the bite-in sleeve 3 and the joint body 1 is sealed.
- a through hole 23 is formed in the center of the side wall 22 of the fastening nut 2 for allowing the connecting pipe 5 to pass therethrough.
- the inner wall surface of the side wall 22 is a pressing surface 24 that presses the biting sleeve 3.
- a female screw 25 that is screwed into the male screw 15 of the joint body 1 is formed.
- a bite type sleeve 3 formed integrally with the fastening nut 2 is disposed.
- the bite type sleeve 3 has a through hole 31 for fitting the connection pipe 5, and is fitted to the outer periphery of the connection pipe 5. (See Figure 5).
- the rear end surface of the bite type sleeve 3 is a pressure receiving surface 32 that comes into contact with the pressing surface 24 of the fastening nut 2.
- the outer peripheral surface of the bite type sleeve 3 is a tapered outer peripheral surface 33 inclined at an angle ⁇ with respect to the center line. The taper outer peripheral surface 33 is reduced in diameter as it approaches the inside of the joint body 1.
- the inclination angle ⁇ is such that the leading end 3a of the bite-in sleeve 3 is bent with a small force, and the leading end 3a is not pushed into the connecting pipe 5 and is pushed between the connecting pipe 5 and the pipe connecting part 13.
- 22 is an inclination angle of a large diameter portion 17b described later of the guide taper surface 17.
- the inclination angle j3 is set to 15 °, and the thickness at the distal end portion 3a of the bite-in sleeve 3 is about 0.:! To about 0.5 mm when the outer diameter of the connecting pipe 5 is 9.52 mm. It is set.
- the fastening nut 2 and the bite type sleeve 3 are placed in the vicinity of the pressure receiving surface 32 as shown in FIG. Thus, they are integrally formed so as to be connected to each other by a thin-walled connecting portion 26 spanned between the fastening nut 2 and the bite type sleeve 3.
- the thin connecting portion 26 the portion connected to the tapered outer peripheral surface 33 is the thinnest portion 26a.
- the thickness of the thinnest part 26a is set to a thickness that is sheared by the force that presses the biting sleeve 3 generated in the axial direction when the fastening nut 2 is fastened to the joint body 1 using a fastener. Is done.
- the rear side of the bite sleeve 3 in the fastening nut 2 is thin so that the bite sleeve 3 separated from the fastening nut 2 can approach until it comes into contact with the pressing surface 24 of the side wall 22 of the fastening nut 2.
- the inner peripheral surface of the fastening nut 2 between the connecting portion 26 and the pressing surface 24 has a larger diameter than the maximum outer diameter portion of the tapered outer peripheral surface 33.
- the guide taper surface 17 includes a small-diameter portion 17a for guiding the tip 3a of the bite-in sleeve 3 into the connecting pipe 5, and a taper outer surface of the bite-in sleeve 3 to seal the bite-in sleeve 3 and the joint body 1. And a large-diameter portion 17b closely contacting 33.
- the small diameter portion 17a is inclined at an angle ⁇ with respect to the central axis.
- the large diameter portion 17b is inclined at an angle ⁇ 2 with respect to the central axis.
- the inclination angle ⁇ 1 of the small diameter portion 17a is set larger than the inclination angle ⁇ 2 of the large diameter portion 17b.
- the inclination angle ⁇ ⁇ is preferably 25 ° to 35 °, more preferably 30 ° to 35 °
- the inclination angle ⁇ 2 is preferably 15 ° to 25 °. More preferably 20. ⁇ 25 °.
- the bite type pipe connection structure of the first embodiment is a structure for connecting the connection pipe 5, and specifically includes a joint body 1, a fastening nut 2, and a bite type sleeve 3.
- connection pipe 5 using the bite type pipe joint having the above bite type pipe connection structure will be described with reference to FIGS.
- the fixed pipe 4 is connected to the joint body 1 by brazing in advance. Further, the tip 5a of the connection pipe 5 is not in contact with the innermost part 16a of the pipe connection port 16, and there is a gap L between the front end 5a of the connection pipe 5 and the innermost part 16a of the pipe connection port 16. Exists.
- connection pipe 5 As shown in Fig. 6 (a), first, the distal end portion of the connection pipe 5 is inserted into the through hole 23 of the fastening nut 2 and the through hole 31 of the biting sleeve 3, and the fastening nut 2 and the biting sleeve are inserted. Assemble 3 to connecting pipe 5. Next, the tip end of the connection pipe 5 is inserted into the pipe connection port 16 of the pipe connection part 13. At this time, do not allow the tip 5a of the connection pipe 5 to abut the innermost part 16a of the pipe connection port 16. That is, a gap L is formed between the tip 5 a of the connection pipe 5 and the innermost part 16 a of the pipe connection port 16.
- the thinnest portion 26a of the thin-walled connecting portion 26 is sheared by the axial pressing force from the fastening nut 2, and the bite type sleeve 3 is separated from the fastening nut 2. .
- the pressing surface 24 of the fastening nut 2 comes into contact with the pressure receiving surface 32 of the bite-in sleeve 3 before long. Then, when the pressure receiving surface 32 of the bite-in sleeve 3 is pressed by the pressing surface 24 of the fastening nut 2, the taper outer surface 33 of the bite-in sleeve 3 becomes the guide taper surface as shown in FIG. Before contacting the inner peripheral surface of the 17 large-diameter portion 17b, first, the leading end 3a of the bite-in sleeve 3 bites into the connecting pipe 5 by a predetermined amount.
- the tip 3a of the bite-in sleeve 3 bites into the connecting pipe 5, and the tapered outer peripheral surface 33 of the bite-in sleeve 3 is the large-diameter part 17b. Adhere closely. In this state, a gap L that is smaller than the initial gap remains between the tip 5a of the connection pipe 5 and the innermost part 16a of the pipe connection port 16, but the tip 3a of the bite-in sleeve 3 is the bite-in sleeve 3 The seal between the pipe and the connecting pipe 5 and the connection pipe 5 are fixed enough to prevent the trouble.
- the taper length T (see FIGS. 9 (a) and 9 (b)) or the inclination angle ct l of the small diameter portion 17a may be variously changed.
- the taper length T or the inclination angle ⁇ 1 of the small diameter portion 17a is changed, the amount of biting of the tip portion 3a of the biting sleeve 3 is changed accordingly.
- 9 (a) and 9 (b) show a modified example in which the taper length T of the small diameter portion 17a is changed. Compared to the case of FIG. 9 (a), the case of FIG. 9 (b) is shown.
- the taper length T of the small diameter part 17a is larger. As can be seen from FIGS.
- FIGS. 10 (a) and 9 (b) show a modified example in which the inclination angle 1 of the small diameter portion 17a is changed. Compared to Fig. 10 (a), Fig. 10 (b) On the other hand, the inclination angle 1 of the small diameter part 17a is large. As can be seen from FIGS.
- the leading end portion 3a of the bite-type sleeve 3 has a relatively large bite angle. It can bite into the connecting pipe 5 with. As a result, the pushing force toward the innermost part 16a of the pipe connection port 16 acting on the connection pipe 5 is reduced, so that the tip 5a of the connection pipe 5 is inserted to the innermost part 16a of the pipe connection port 16. Even if there is not, the connecting pipe 5 does not move greatly as the fastening nut 2 is tightened. As a result, the sealing performance can be improved.
- the biting angle refers to the angle of the biting direction of the tip 3a with respect to the central axis.
- the taper outer peripheral surface 33 of the bite type sleeve 3 comes into close contact with the large diameter part 17b of the guide taper surface 17.
- the taper outer peripheral surface 33 and the large diameter portion 17b can be brought into close contact with each other without hindrance while securing the amount of biting of the tip portion 3a.
- the large diameter portion 17b where the tapered outer peripheral surface 33 of the bite-in sleeve 3 is in close contact is a portion of the guide taper surface 17 whose inclination angle with respect to the central axis is relatively small. A large pressing force is not necessary to bring 17b into close contact, and the contact area between the tapered outer peripheral surface 33 and the large diameter portion 17b can be increased.
- the bite type sleeve 3 is formed integrally with the fastening nut 2 so that it is separated from the fastening nut 2 by the axial pressing force from the fastening nut 2 before it bites into the connecting pipe 5. It is configured. Since the bite-in sleeve 3 is integrally formed with the fastening nut 2, the number of parts is reduced and the cost for managing parts is reduced. In addition, the process of attaching the biting sleeve 3 separately from the fastening nut 2 to the connection pipe 5 or attaching it to the pipe connection port 16 is omitted, so that workability is further improved.
- the bite type sleeve 3 is connected to the inner wall of the fastening nut 2 through the thin connecting portion 26. Therefore, when the fastening nut 2 is tightened, the bite type sleeve 3 is easily separated from the fastening nut 2.
- the bite-in sleeve 3 is connected to the fastening nut 2 and Grip into the connecting pipe 5 without rotating. Therefore, if the biting sleeve 3 rotates together with the fastening nut 2 while the tip 3A is biting into the connecting pipe 5, scratches in the rotational direction may be formed on the surface of the connecting pipe 5, but such a risk may occur. There is no.
- the bite type pipe joint of the present embodiment is a two-way pipe joint, and the bite type pipe connection structure as described above is used for one joint part, and a pipe by brazing is used for the other joint part. A connection structure is used.
- bite-type pipe joints are suitable when only one joint part is on-site piping.
- the bite type pipe connection structure according to the second embodiment and the bite type pipe joint using the same are obtained by changing the guide taper surface 17 in the first embodiment. That is, in the second embodiment, as shown in FIG. 11, the guide taper surface 17 has an intermediate portion 17c between the small diameter portion 17a and the large diameter portion 17b.
- the intermediate portion 17c has an inclination angle smaller than the inclination angle ⁇ 2 of the large diameter portion 17b.
- the inclination angle of the intermediate portion 17c can be appropriately changed as long as it is smaller than the inclination angle ⁇ 2 .
- the inclination angle of the intermediate portion 17c is the same as the inclination angle of the large diameter portion 17b, the first embodiment itself is obtained.
- the inclination angle of the intermediate portion 17c is set to 0 °. That is, the intermediate part 17c is a plane parallel to the central axis.
- the first tightening of the fastening nut 2 and the completion of fastening of the fastening nut 2 are the first.
- the shape of the guide taper surface 17 is different, and the connection pipe 5 can be connected in the same manner as in the first embodiment.
- Figure 12 (a) corresponds to Figure 6 (a)
- Figure 12 (b) corresponds to Figure 6 (c).
- the amount of biting of the distal end portion 3a of the biting sleeve 3 can be adjusted by changing the taper length T of the small diameter portion 17a as described in the first embodiment.
- the amount of biting of the tip portion 3a of the biting sleeve 3 can also be changed by changing the length M of the intermediate portion 17c (see FIGS. 13 (a) and 13 (b)).
- FIG. 13 (a) and FIG. 13 (b) show a modified example in which the length M of the intermediate portion 17c is changed.
- the middle part 17c has a larger length M.
- FIGS. 13 (a) and 13 (b) as the length M of the intermediate portion 17c becomes smaller, the axial direction of the bite sleeve 3 until the tape outer peripheral surface 33 comes into close contact with the large diameter portion 17b. The travel distance S becomes smaller.
- the taper outer peripheral surface 33 becomes the large diameter portion 17b while the amount of biting of the tip portion 3a is constant.
- the point of close contact can be changed in various ways.
- the bite type pipe connection structure and the bite type pipe joint using the same according to the third embodiment are obtained by changing the guide taper surface 17 and the taper outer peripheral surface 33 of the bite type sleeve 3 in the first embodiment. is there. That is, in the third embodiment, the entire guide taper surface 17 is inclined with respect to the central axis by the same angle as the inclination angle of the small diameter portion 17a in the first embodiment. Further, the tapered outer peripheral surface 33 of the bite-in sleeve 3 has three tapered outer peripheral surfaces having different inclination angles with respect to the central axis, that is, the first tapered outer peripheral surface 33a, the second tapered outer peripheral surface 33b, and the third tapered outer peripheral surface 33c.
- the first taper outer peripheral surface 33 a is an outer peripheral surface of the distal end portion 3 a of the bite type sleeve 3.
- the second taper outer peripheral surface 33b is a front portion of the outer peripheral surface of the rear side portion 3c of the bite-in sleeve 3, and the third taper outer peripheral surface
- the surface 33c is a rear side portion of the outer peripheral surface of the rear side portion 3c of the bite type sleeve 3.
- the inclination angle 1 of the first taper outer peripheral surface 33a is the same as the inclination angle i3 of the bite type sleeve 3 of the first embodiment.
- the second taper outer peripheral surface 33 b is used to closely contact the guide taper surface 17.
- a step H is formed between the first tapered outer peripheral surface 33a and the second tapered outer peripheral surface 33b.
- the outer diameter of the second taper outer surface 33b is larger than the outer diameter of the first taper outer surface 33a.
- the inclination angle j3 2 of the second taper outer peripheral surface 33b is slightly smaller than the inclination angle 2 of the guide taper surface 17.
- the inclination angle of the third taper outer peripheral surface 33c is smaller than those of the first taper outer peripheral surface 33a and the second taper outer peripheral surface 33b.
- the connecting pipe 5 is connected in the same manner as in the first embodiment. Can do.
- the first taper outer surface 33a of the rear side 3b of the biting sleeve 3 is in close contact with the guide taper surface 17. (See Fig. 16 (b)).
- Fig. 17 (a) and Fig. 17 (b) show a modified example in which the size of the step H is changed, and the case of Fig. 17 (b) is better than the case of Fig. 17 (a).
- the size of the step H is small.
- FIG. 17 (a) and FIG. 17 (b) as the difference H decreases, the biting sleeve 3 in the axial direction until the second taper outer peripheral surface 33b comes into close contact with the guide taper surface 17 is increased.
- the amount of movement S increases, and the amount of biting at the tip 3a of the biting sleeve 3 increases.
- the second tapered outer peripheral surface increases as the taper length E of the first tapered outer peripheral surface 33a of the bite-in sleeve 3 increases.
- the amount of axial movement S of the bite sleeve 3 until 33b comes into close contact with the guide taper surface 17 increases.
- the bite type pipe connection structure and the bite type pipe joint using the same will be described with reference to FIGS. 18 (a) to 18 (c). Detailed descriptions of the same parts as in the first embodiment in the fourth embodiment are omitted.
- the bite type sleeve 3 is integrated with the fastening nut 2 as in the first embodiment. Integrated into the main body 1 The bite type sleeve 3 is formed separately from the joint body 1 and is integrated by bonding to the joint body 1.
- the configurations of the joint body 1 and the fastening nut 2 are partially changed from the first embodiment.
- the reference numerals in the first embodiment are used.
- the joint body 1 has a nut portion 12 and a pipe connection portion 13 as in the case of the first embodiment.
- the socket portion 11 is omitted in FIG. 18, but is the same as in the case of the first embodiment.
- the pipe connection portion 13 has a male screw 15, a pipe connection port 16, a guide taper surface 17 having a small diameter portion 17a and a large diameter portion 17b, and a communication hole 18. ing.
- the end of the pipe connection portion 13 on the side close to the fastening nut 2 has an extension portion 41, which extends toward the fastening nut 2 as compared with the case of the first embodiment.
- An inward wall is formed at the tip of the extension portion 41, and an adhesive hole 42 is formed at the center of the inward wall.
- the bite-in sleeve 3 is integrated with the joint body 1 by inserting the bite-in sleeve 3 into the bonding hole 42 and bonding the outer peripheral surface of the bite-in sleeve 3 and the inner peripheral surface of the bonding hole 42. ing.
- the inner peripheral surface of the bonding hole 42 bonded to the outer peripheral surface of the bite-in sleeve 3 constitutes the bonding surface.
- a through hole 23 is formed in the center of the side wall 22 of the fastening nut 2 to allow the connecting pipe 5 to pass therethrough.
- a female screw 25 that is screwed into the male screw 15 of the joint body 1 is formed.
- the fastening nut 2 of the fourth embodiment has a protruding part 4 3 extending from the inner wall surface of the side wall 22 toward the joint body 1 (toward the inside of the fastening nut 2). And different.
- the end surface of the protrusion 43 near the joint body 1 is a pressing surface 44 that presses the bite-in sleeve 3.
- the bite type sleeve 3 has a through hole 31 for fitting the connection pipe 5 as in the first embodiment.
- the outer peripheral surface of the front end portion of the bite-in sleeve 3 is a tapered outer peripheral surface 33 inclined at an angle ⁇ with respect to the central axis, and the outer peripheral surface of the rear portion of the bite-in sleeve 3 is a joint surface substantially parallel to the central axis. 36.
- the rear end surface of the bite type sleeve 3 is a pressure receiving surface 37 that abuts against the pressing surface 44 of the fastening nut 2.
- the bite type sleeve 3 is formed separately from the fastening nut 2 and the joint body 1 from the same copper alloy as the fastening nut 2 and the joint body 1. Thereafter, the biting sleeve 3 is integrated with the joint body 1 by bonding the joining surface 36 of the biting sleeve 3 to the inner peripheral surface (joining surface) of the bonding hole 42. Adhesion between the outer peripheral surface of the bite-in sleeve 3 and the inner peripheral surface of the bonding hole 42 separates the bite-in sleeve 3 from the joint body 1 by the axial pressing force of the fastening nut 2 force. It is moderate.
- connection pipe 5 is connected as follows. First, the distal end portion of the connection pipe 5 in a state where the fastening nut 2 and the bite type sleeve 3 are assembled is inserted into the pipe connection port 16. At this time, the tip 5a of the connection pipe 5 is not brought into contact with the innermost part 16a of the pipe connection port 16, and a gap L is formed between the tip 5a of the connection pipe 5 and the innermost part 16a of the pipe connection port 16. To do.
- the fastening nut 2 is tightened to the joint body 1 until the pressing surface 44 of the fastening nut 2 contacts the pressure receiving surface 37 of the biting sleeve 3 (see FIG. 18 (a)).
- the force from the pressing surface 44 of the fastening nut 2 acts on the pressure receiving surface 37 of the bite type sleeve 3, so that the bite type sleeve 3 is separated from the joint body 1 and the guide taper surface. (See Fig. 18 (b)).
- the pressing force toward the innermost part 16a of the pipe connection port 16 is not applied to the connection pipe 5, the size of the gap L remains unchanged.
- the distal end portion 3a of the bite type sleeve 3 is deformed so as to bite into the connection pipe 5 at a large bite angle while being guided by the small diameter portion 17a of the guide taper surface 17.
- the pushing force acts on the connection pipe 5 toward the innermost part 16a of the pipe connection port 16
- the size of the gap L is reduced.
- the inclination angle 1 of the small diameter portion 17a is set to be relatively large, the pushing force toward the innermost portion 16a of the pipe connection port 16 applied to the connection pipe 5 is relatively small. The movement of the connecting pipe 5 is small It can be suppressed.
- the fastening nut 2 is tightened by tightening the fastening nut 2 until the tapered outer peripheral surface 33 of the bite-in sleeve 3 is in close contact with the large diameter portion 17b of the guide tapered surface 17.
- the conclusion is complete. In this way, even if there is a gap L between the tip 5a of the connection pipe 5 and the innermost part 16a of the pipe connection port 16, the connection pipe 5 is prevented from leaking outside. It is securely connected to the fitting body 1.
- the bite type pipe connection structure and the bite type pipe joint using the same according to the fourth embodiment are effective in the effects (1), (2), (5) and (6) described above in the first embodiment. In addition, the following effects can be achieved.
- the outer peripheral surface of the bite type sleeve 3 is integrated with the inner peripheral surface of the bonding hole 42 of the joint main body 1 to be integrated with the joint main body 1. Adhesion between the outer peripheral surface of the biting sleeve 3 and the inner peripheral surface of the bonding hole 42 is caused by the axial pressing force from the fastening nut 2 generated when the fastening nut 2 is tightened. This is the degree to which the hub 3 is separated from the joint body 1. Therefore, the bite type sleeve 3 is easily and automatically separated from the joint body 1 by tightening the fastening nut 2.
- FIGS. 19 (a) to 19 (c) Detailed description of the same parts as in the first embodiment in the fifth embodiment will be omitted.
- the bite type sleeve 3 is not integrated with either the fastening nut 2 or the joint body 1, and the fastening nut 2 and It is separate from the joint body 1. Are separated and independent. Further, the bite type sleeve 3 of the fifth embodiment can be divided into two. In the following description, the same configuration as that of the first embodiment not described in FIGS. 19 (a) to 19 (c) is used. When describing, the code
- the bite type sleeve 3 is formed separately from the fastening nut 2 and the joint body 1 from the same copper alloy as the fastening nut 2 and the joint body 1.
- the bite type sleeve 3 has a through hole 31 for fitting the connection pipe 5 as in the case of the first embodiment.
- the bite type sleeve 3 includes a joint body side portion 311 and a fastening nut side portion 312 that can be separated from each other. As shown in Fig. 19 (a) to Fig. 19 (c), the dividing line between the joint body side portion 311 and the fastening nut side portion 312 is perpendicular to the center line of the pipe joint on the outer peripheral side, and on the inner peripheral side. Inclined in the same direction as the guide taper surface 17.
- the inclination angle of the dividing line on the inner peripheral side is larger than the inclination angle of the guide taper surface 17.
- the outer peripheral surface of the joint body side portion 311 is a tapered outer peripheral surface 33 inclined at an angle of / 3 with respect to the central axis.
- the rear end surface of the bite type sleeve 3 (that is, the rear end surface of the fastening nut side portion 312) is a pressure receiving surface 35 pressed by the fastening nut 2.
- the pressure receiving surface 35 is inclined by a predetermined angle with respect to the central axis.
- a substantially cylindrical space is defined inside the fastening nut 2.
- the inner wall surface of the side wall 22 of the fastening nut 2 is a pressing surface 51 for pressing the pressure receiving surface 35 of the bite type sleeve 3.
- the pressing surface 51 is inclined by a predetermined angle with respect to the central axis.
- the bite type pipe connection structure and the bite type pipe joint using the same according to the fifth embodiment have the same configuration as that of the first embodiment except for the points other than the above.
- the configuration of the joint body 1 having the guide taper surface 17 is exactly the same as that in the first embodiment.
- connection pipe 5 is connected in the same manner as in the first embodiment. That is, first, as shown in FIG. 19 (a), the distal end portion of the connection pipe 5 in a state where the fastening nut 2 and the bite type sleeve 3 are assembled is inserted into the pipe connection port 16 of the joint body 1. . At this time, the tip 5a of the connection pipe 5 is not brought into contact with the innermost part 16a of the pipe connection port 16, and a gap L is formed between the tip 5a of the connection pipe 5 and the innermost part 16a of the pipe connection port 16. .
- the distal end portion 3a of the bite type sleeve 3 is deformed so as to bite into the connection pipe 5 at a large bite angle while being guided by the small diameter portion 17a of the guide taper surface 17.
- the pushing force acts on the connection pipe 5 toward the innermost part 16a of the pipe connection port 16
- the size of the gap L is reduced.
- the inclination angle 1 of the small diameter portion 17a is set to be relatively large, the pushing force toward the innermost portion 16a of the pipe connection port 16 applied to the connection pipe 5 is relatively small. The movement of the connecting pipe 5 can be suppressed a little.
- the fastening nut 2 is tightened by tightening the fastening nut 2 until the tapered outer peripheral surface 33 of the bite-in sleeve 3 is in close contact with the large diameter portion 17b of the guide tapered surface 17.
- the conclusion is complete. In this way, even if there is a gap L between the tip 5a of the connection pipe 5 and the innermost part 16a of the pipe connection port 16, the connection pipe 5 is prevented from leaking outside. It is securely connected to the fitting body 1.
- a conventionally known bite type sleeve 3 can be used. Further, the bite type pipe connection structure according to the fifth embodiment and the bite type pipe joint using the same have the effects (1), (2), (5) and (6) described above in the first embodiment. be able to.
- the sixth embodiment is a shut-off valve 60 having a connection portion extending in three directions provided with the bite type pipe connection structure according to the first embodiment in a pipe connection portion.
- the shut-off valve 60 includes a substantially cross-shaped housing in which the first cylindrical portion 61, the second cylindrical portion 62, the third cylindrical portion 63, and the fourth cylindrical portion 64 are mutually connected. Connected to communicate.
- the first cylindrical portion 61 forms a first port and is connected by brazing to a fixed pipe (not shown).
- the second cylindrical portion 62 forms a second port, has the bite type pipe connection structure according to the first embodiment, and the connection pipe 68 is detachably connected.
- the third cylindrical portion 63 forms a service port with a check valve for evacuating the refrigerant circuit and filling the refrigerant circuit with the refrigerant.
- the fourth cylindrical part 64 forms an operating part of the closing valve 60.
- the second cylindrical portion 62 has a tube connection portion 65 similar to the tube connection portion 13 of the first embodiment.
- a fastening nut 66 is screwed into the pipe connecting portion 65.
- a bite type sleeve 67 is provided between the fastening nut 66 and the end of the pipe connecting portion 65.
- the fastening nut 66 and the bite type sleeve 67 have the same configuration as the fastening nut 2 and the bite type sleeve 3 in the first embodiment.
- the fastening nut 66 is integrated with the biting sleeve 67 before being fastened to the second cylindrical portion 62.
- the connecting pipe 68 is connected to the pipe connecting portion 65 of the shut-off valve 60 using the same bite type pipe connecting structure as in the first embodiment. Therefore, in the shutoff valve 60 of the sixth embodiment, fluid can be prevented from leaking from the connection portion with the connection pipe 68, and workability at the time of pipe connection is improved. Even if the fastening nut 66 is tightened in a state where there is a gap L between the tip of the connection pipe 68 and the innermost part of the pipe connection port 65a, the seal and connection of the connection part with the connection pipe 68 are performed.
- the pipe 68 can be fixed without any trouble.
- the seventh embodiment is a different diameter pipe joint 70 having a connecting portion extending in two directions provided with the bite type pipe connecting structure according to the first embodiment in the pipe connecting portion.
- the different diameter pipe joint 70 includes a joint body 71, and two pipe connection portions 72 and 76 are provided at both ends of the joint body 71.
- Each of the pipe connecting portions 72 and 76 has the same structure as the pipe connecting portion 13 in the first embodiment.
- Fastening nuts 73 and 77 are screwed into the pipe connecting portions 72 and 76, respectively.
- the bite type sleeves 74 and 78 are arranged between the fastening nuts 73 and 77 and the pipe connecting portions 72 and 76, respectively.
- the fastening nuts 73 and 77 and the bite type sleeves 74 and 78 have the same configuration as the fastening nut 2 and the bite type sleeve 3 in the first embodiment, respectively.
- the diameter of the connecting pipe 75 is larger than the diameter of the connecting pipe 79.
- the diameter of the pipe connection part 72 to which the connection pipe 75 is connected is larger than the diameter of the pipe connection part 76 to which the connection pipe 79 is connected.
- the different diameter pipe joint 70 of the seventh embodiment includes pipe connection portions 72, 76 extending in two directions, and the pipe connection structure of the pipe connection portions 72, 76 is a bite type according to the first embodiment.
- Pipe connection structure is applied. According to the different diameter pipe joint 70, fluid leakage from the pipe connections 72 and 76 is suppressed. This also improves workability when connecting pipes. Even if the fastening nuts 73 and 77 are fastened with a gap L between the tip of each connecting pipe 75 and 79 and the innermost part of each pipe connection 72a and 76a, the connection It is possible to seal the connecting portions of the pipes 75 and 79 and fix the connecting pipes 75 and 79 without any trouble.
- FIG. 22 shows the overall configuration of a separation-type air conditioner as a refrigeration cycle apparatus that uses a hydrated carbon (HC) refrigerant such as propane.
- the separation type air conditioner shown in FIG. 22 includes one outdoor unit 81 and one indoor unit 82.
- a closing valve 83 is attached to the entrance / exit of the outdoor unit 81, and a pipe joint 84 is attached to the entrance / exit of the indoor unit 82.
- the shut-off valve 83 and the pipe joint 84 are connected to each other via a communication pipe 85.
- the bite type pipe connection structure according to the first embodiment is adopted at the connection portion between the shut-off valve 83 and the pipe joint 84 and the communication pipe 85. Therefore, the closing valve 60 of the sixth embodiment is used for the closing valve 83, and the bite type pipe fitting of the first embodiment is used for the pipe joint 84.
- connection structure between the closing valve 83 and the pipe joint 84 and the connecting pipe 85 that is detachably connected thereto is the bite type according to the first embodiment. It is the same as the pipe connection structure. Therefore, the refrigerant can be prevented from leaking from the pipe connection portion of the communication pipe 85, and workability when connecting the communication pipe 85 is improved. In addition, the use of shut-off valves and pipe joints with little refrigerant leakage improves the reliability of refrigeration cycle equipment that uses HC refrigerant.
- FIG. Figure 23 shows the overall configuration of a separation-type air conditioner as a refrigeration cycle device using HC refrigerant such as propane.
- the separation-type air conditioner shown in FIG. 23 includes one outdoor unit 91 and a plurality of (four) indoor units 92.
- a shut-off valve 93 is attached to the entrance / exit of the outdoor unit 91.
- the main connection pipe 94 is connected to the closing valve 93 and the branch pipe 95 having a diameter smaller than that of the main connection pipe 94 is connected to the shut-off valve 93 by the local piping construction.
- Branch The pipe 95 is connected to the main communication pipe 94 using a different diameter pipe joint 96.
- Each indoor unit 92 is connected in parallel to the outdoor unit 91 via a branch pipe 95 and a main communication pipe 94.
- the bite type pipe connection structure according to the first embodiment is applied to the pipe connection portion of the closing valve 93. Specifically, the closing valve 60 of the sixth embodiment is used. ing. Further, the bite type pipe connection structure according to the first embodiment is applied to the pipe connection portion of the different diameter pipe joint 96, and specifically, the different diameter pipe joint 70 of the seventh embodiment is used.
- the bit connection type pipe connection structure according to the first embodiment is provided at the pipe connection portions of the main connection pipe 94 and the branch pipe 95 that are piped on site. It is used. For this reason, the refrigerant can be prevented from leaking from the pipe connection portions of the main connection pipe 94 and the branch pipe 95, and workability when the main connection pipe 94 and the branch pipe 95 are piped locally is also improved.
- the use of a shut-off valve and a different diameter pipe joint with less refrigerant leakage improves the reliability of the refrigeration cycle apparatus using HC refrigerant.
- FIG. 24 shows the overall configuration of a heat pump type hot water supply device as a refrigeration cycle device using a natural refrigerant such as carbon dioxide.
- a heat pump type hot water supply system the heat of condensation in the condenser is used as the hot water supply heat source.
- the heat pump hot water supply apparatus shown in FIG. 24 includes a refrigerant circuit in which the refrigerant circulates in the direction of the solid arrow in FIG.
- a compressor 101 In the refrigerant circuit, a compressor 101, a water heat exchanger 102 that dissipates the heat of condensation of the refrigerant to hot water supply water, an expansion valve 103, and a heat source heat exchanger 104 that uses outside air as a heat source are sequentially arranged and connected.
- the refrigerant circuit is filled with a refrigerant composed of carbon dioxide.
- the water heat exchanger 102 uses the heat from the outside air to heat the hot water supply water. Yes.
- Hot water supply water circulates in the order of the bottom of the tank 105.
- a hot water outlet 107 for supplying hot water to a hot water tap, a bathtub, etc. is connected to the upper part of the hot water storage tank 105.
- a water supply pipe 108 is connected to the bottom.
- the heat pump type hot water supply apparatus includes an outdoor unit 109 including a heat source heat exchanger 104 and a blower 104a, and an indoor unit 110.
- the indoor unit 110 includes a compressor 101, a water heat exchanger 102 and It comprises a refrigerant circuit device including an expansion valve 103 and a hot water supply circuit device including a hot water storage tank 105 and a water circulation pump 106.
- a closing valve 111 is connected to the entrance / exit of the indoor unit 110, and a pipe joint 112 is connected to the entrance / exit of the outdoor unit 109.
- the shut-off valve 11 1 and the pipe joint 112 are connected to each other through a connecting pipe 113 that is piped on site.
- the bite type pipe connection structure according to the first embodiment is applied to the connection portion of the communication pipe 113.
- the closing valve 60 of the sixth embodiment is used for the closing valve 111
- the pipe joint of the first embodiment is used for the pipe joint 112.
- pipe joints are also used for hot water pipes. That is, the hot water outlet pipe 107 is connected to the upper part of the hot water storage tank 105 via the pipe joint 115.
- the water supply pipe 108 is connected to the bottom of the hot water storage tank 105 via a pipe joint 115.
- the bite type pipe connection structure according to the first embodiment is also applied to these pipe joints 115. Specifically, the bite type pipe joint according to the first embodiment is used.
- high temperature hot water supply water is obtained by performing a heat pump operation in a supercritical refrigeration cycle in a state where a refrigerant such as carbon dioxide is filled in a refrigerant circuit. can get.
- a refrigerant such as carbon dioxide
- the refrigerant pressure becomes high, it is important to prevent the refrigerant from leaking from a pipe connection portion that is piped locally.
- the shut-off valve 111 and the pipe joint 112 to which the bite type pipe connection structure according to the first embodiment is applied are used, a highly reliable device can be realized and piping can be performed locally. Workability when connecting is also improved.
- the pipe joint 115 applying the bite type pipe connection structure according to the first embodiment is used for the pipe connection structure of the hot water supply circuit, a more reliable device can be realized and the pipe connection can be made locally. The workability at the time is further improved.
- a heat exchanger for a heat source having a low pressure is included in an independent outdoor unit 109. Therefore, it is possible to install the heat source heat exchanger 104 in a suitable outdoor location while keeping heat loss small.
- FIG. 25 shows the overall configuration of a heat pump type hot water supply apparatus as a refrigeration cycle apparatus using a natural refrigerant such as carbon dioxide.
- the heat pump type hot water supply device of Fig. 25 is common to the heat pump type hot water supply device of Fig. 24 in that it uses the heat of condensation of the condenser that constitutes the refrigeration cycle as a hot water supply heat source. Is different from the heat pump type hot water supply apparatus of FIG.
- the heat pump hot water supply apparatus shown in Fig. 25 includes a heat source unit 121 and a hot water storage unit 131.
- the heat source unit 121 is a unit including a refrigeration cycle portion, and includes a refrigerant circuit in which the refrigerant circulates in the direction of the solid line arrow in FIG.
- a compressor 122, a water heat exchanger 123 that radiates the heat of condensation of the refrigerant and heats hot water supply water, an expansion valve 124, and a heat source heat exchanger 125 that uses outside air as a heat source are arranged and connected in this order.
- the heat source heat exchanger 125 is provided with a blower 125a.
- the refrigerant circuit is filled with natural refrigerant such as carbon dioxide and is operated in a supercritical refrigeration cycle.
- Hot water storage unit 131 includes a hot water supply circuit portion.
- the hot water supply circuit as shown by the dashed arrows in FIG. 25, the bottom of the front-stage hot water storage tank 132, the water circulation pump 133, the water heat exchanger 123, the upper part of the rear-stage hot water storage tank 134, the rear-stage hot-water storage tank 134
- Hot water supply water circulates in the order of the bottom, the upper part of the front-stage hot water storage tank 132, and the bottom of the front-stage hot water storage tank 132.
- a hot water discharge pipe 135 is connected to the upper part of the rear-stage hot water storage tank 134, and a water supply pipe 136 is connected to the bottom of the front-stage hot water storage tank 132.
- the hot-water supply water heated by the water heat exchanger 123 is sent to the upper part of the rear-stage hot water storage tank 134, and the water at the bottom of the front-stage hot water storage tank 132 is sent to the water heat exchanger 123.
- the high-temperature water is filled from the top to the bottom of the rear-stage hot water storage tank 134 and then is filled from the top to the bottom of the front-stage hot water storage tank 132 in order. That is, at the start of operation, only the upper part of the rear-stage hot water storage tank 134 is filled with high-temperature water, but as it is operated, the hot water flows into the bottom of the rear-stage hot water storage tank 134, the front-stage hot water storage tank 132. And the bottom of the front-side hot water storage tank 132 are also filled.
- each water pipe 138 connects the hot water storage unit 131 and the heat source unit 121 to each other via a pipe joint 139. Furthermore, the hot water outlet pipe 135 and the water supply pipe 136 are also connected to the rear-stage hot water storage tank 134 and the front-stage hot water storage tank 132 via the pipe joint 140, respectively. Are connected.
- the bite type pipe connection structure according to the first embodiment is applied to the pipe connection parts in these pipe joints 139 and 140, and specifically, the bite type pipe joint according to the first embodiment is used. ing.
- the refrigerant circuit is filled with a refrigerant such as carbon dioxide, and the heat pump is a supercritical refrigeration site.
- a refrigerant such as carbon dioxide
- the heat pump is a supercritical refrigeration site.
- hot water supply water is obtained.
- pipe joints 139 and 140 having the bite type pipe connection structure according to the first embodiment are used in the hot water supply circuit.
- the boundary area between the high temperature layer and the low temperature layer of hot water supply water is reduced in the hot water storage tank, and as a result, the thermal efficiency is increased.
- the body diameter of the hot water storage tank can be reduced, and the installation space for the shellfish hot water tank can be reduced.
- Each pipe connection structure according to the second to fifth embodiments may be applied to the different diameter pipe joint 70 of the seventh embodiment and the closing valve 60 of the sixth embodiment, or to other pipe joints and valves. May be. Also in this case, leakage from the pipe connection portion can be suppressed, and workability of pipe connection is improved.
- a pipe joint or a valve such as a shut-off valve provided with the pipe connection structure of any of the second to fifth embodiments may be used for the pipe connection portion.
- a pipe joint or a valve such as a shut-off valve provided with the pipe connection structure of any of the second to fifth embodiments may be used for the pipe connection portion.
- leakage from the pipe connection can be suppressed, and the workability of pipe connection is improved.
- the erosion formed as an independent part, the embedded sleeve 3, is used.
- a refrigerant other than the HC refrigerant may be used.
- a refrigerant other than carbon dioxide may be used.
- the pipe connection structure according to the first embodiment is applied only to the connection of pipes constructed on site, but it is also applied to the connection of pipes in the machine. You can do it.
- all the pipes connected to the hot water storage tanks 105, 132, 134 have the first implementation.
- a bite type pipe joint provided with a bite type pipe connection structure according to the embodiment may be used.
- the hot water supply device may be another hot water supply device such as a gas-fired hot water supply device or an electric water heater.
- the bite type pipe connection structure according to the present invention may be applied to water pipes used in these hot water supply apparatuses.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Joints With Pressure Members (AREA)
- Quick-Acting Or Multi-Walled Pipe Joints (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2007232820A AU2007232820B2 (en) | 2006-03-31 | 2007-03-30 | Flareless pipe coupling structure, flareless pipe coupling method, and on-site pipe coupling method |
EP07740614.8A EP2003385B1 (en) | 2006-03-31 | 2007-03-30 | Flareless pipe coupling structure |
CN2007800116294A CN101415985B (zh) | 2006-03-31 | 2007-03-30 | 咬入式管连接构造、咬入式管连接方法和现场配管连接方法 |
US12/225,113 US7954856B2 (en) | 2006-03-31 | 2007-03-30 | Flareless pipe coupling structure, flareless pipe coupling method, and on-site pipe coupling method |
ES07740614.8T ES2526643T3 (es) | 2006-03-31 | 2007-03-30 | Estructura de acoplamiento de tuberías sin abocardado |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006099475A JP4007391B2 (ja) | 2006-03-31 | 2006-03-31 | 食い込み式管接続構造、管継手、弁、閉鎖弁、冷凍サイクル装置、及び給湯装置 |
JP2006-099475 | 2006-03-31 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2007114360A1 true WO2007114360A1 (ja) | 2007-10-11 |
Family
ID=38563628
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2007/057178 WO2007114360A1 (ja) | 2006-03-31 | 2007-03-30 | 食い込み式管接続構造、食い込み式管接続方法、及び現地配管接続方法 |
Country Status (9)
Country | Link |
---|---|
US (1) | US7954856B2 (ja) |
EP (1) | EP2003385B1 (ja) |
JP (1) | JP4007391B2 (ja) |
KR (1) | KR100983157B1 (ja) |
CN (1) | CN101415985B (ja) |
AU (1) | AU2007232820B2 (ja) |
ES (1) | ES2526643T3 (ja) |
TW (1) | TWI319802B (ja) |
WO (1) | WO2007114360A1 (ja) |
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WO2010084827A1 (ja) * | 2009-01-21 | 2010-07-29 | ダイキン工業株式会社 | 食い込み式管接続構造、弁、食い込み式管継手及び冷凍装置 |
JP2010237170A (ja) * | 2009-03-31 | 2010-10-21 | Ngk Insulators Ltd | 把持治具、並びに、それを用いた計測装置および把持装置 |
JP2014111979A (ja) * | 2012-11-12 | 2014-06-19 | Hatano Seisakusho:Kk | 管継手 |
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US8925976B2 (en) * | 2010-03-02 | 2015-01-06 | Omega Flex, Inc. | Flanged fitting for use with tubing containment system |
CN102430909A (zh) * | 2011-08-29 | 2012-05-02 | 北京二七轨道交通装备有限责任公司 | 卡套式管接头的安装方法 |
WO2017139431A1 (en) | 2016-02-09 | 2017-08-17 | Swagelok Company | Ferrule for a conduit fitting |
JP6509794B2 (ja) * | 2016-10-11 | 2019-05-08 | ダイキン工業株式会社 | 管継手及び空気調和システム |
CN106644286B (zh) * | 2016-12-23 | 2019-01-18 | 湖北三江航天红峰控制有限公司 | 一种低温截止阀密封固定装置 |
KR20210003873A (ko) | 2018-04-27 | 2021-01-12 | 스웨이지락 캄파니 | 도관 피팅용 페룰 조립체 |
JP7182453B2 (ja) * | 2018-12-19 | 2022-12-02 | 日本ピラー工業株式会社 | 管継手 |
JP7185877B2 (ja) | 2019-07-01 | 2022-12-08 | 東尾メック株式会社 | 管継手 |
KR200495822Y1 (ko) * | 2021-03-23 | 2022-09-02 | 서원콤프레샤주식회사 | 공기압축기용 펌프의 피스톤 조립구조 |
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Also Published As
Publication number | Publication date |
---|---|
EP2003385A4 (en) | 2013-09-11 |
AU2007232820A1 (en) | 2007-10-11 |
JP2007271024A (ja) | 2007-10-18 |
EP2003385A2 (en) | 2008-12-17 |
KR20080102209A (ko) | 2008-11-24 |
ES2526643T3 (es) | 2015-01-14 |
KR100983157B1 (ko) | 2010-09-20 |
TWI319802B (en) | 2010-01-21 |
CN101415985B (zh) | 2012-12-12 |
TW200745477A (en) | 2007-12-16 |
US7954856B2 (en) | 2011-06-07 |
CN101415985A (zh) | 2009-04-22 |
AU2007232820B2 (en) | 2011-05-12 |
US20090102191A1 (en) | 2009-04-23 |
EP2003385A9 (en) | 2009-05-06 |
EP2003385B1 (en) | 2014-10-01 |
JP4007391B2 (ja) | 2007-11-14 |
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